Label abbreviations descriptions

METHYLENE CHLORIDE (DICHLOROMETHANE)‡

Chemical Identification
CAS # 75-09-2
Formula
 

CH₂Cl₂
Synonyms
 

dichloromethane; methylene dichloride

Physical Properties
Physical description Colorless liquid with a chloroform-like odor.
Boiling point 104°F Molecular weight 84.9
Freezing point/melting point -139°F Vapor pressure 350 mmHg
Flash point Vapor density 2.93
Specific gravity 1.33 Ionization potential 11.32 eV
Lower explosive limit (LEL) 13% Upper explosive limit (UEL) 23%
NFPA health rating 2 NFPA fire rating 1
NFPA reactivity rating 0 NFPA special instruction
Vapor hazard ratio (VHR)
Historical exceedance percentage
Target organs

Monitoring Methods Used by OSHA
Analyte code (IMIS no.) 1730
Sampling group
Sampler/Sampling media 2 Anasorb 747 sampling tubes (6 mm glass tubes, the front tube contains 400 and the back 200 mg of sorbent) connected in series [SKC 226-82], tube holder [SKC 222-3L-1], Type D cover [SKC 224-29D]
Sampling time*

240 min TWA; 15 min STEL
Sampling volume (TWA)*
 

12 L
Sampling flow rate (TWA)*
 
 

0.05 L/min
Sampling volume (STEL/Peak/C)*

0.75 L
Sampling flow rate (STEL/Peak/C)*

0.05 L/min
Analytical method instruments GC-FID
Method reference OSHA 1025 (fully validated)
Notes
Special requirements

* All sampling instructions above are recommended guidelines for OSHA Compliance Safety and Health Officers (CSHOs), please see the corresponding OSHA method reference for complete details.

Bulk/Wipe Method
Wipe Sampler/Sampling media
Bulk Method

On-Site Screening Techniques
Device CMS Chip
Model/Type Methylene chloride, 10-200 ppm range
Sampling information
(see manufacturer instructions)

Exposure Limits
OSHA PEL
8-hour TWA
(ST) STEL
(C) Ceiling
Peak
NIOSH REL
Up to 10-hour TWA
(ST) STEL
(C) Ceiling
ACGIH TLV©
8-hour TWA
(ST) STEL
(C) Ceiling
CAL/OSHA PEL
8-hour TWA
(ST) STEL
(C) Ceiling
Peak
PEL-TWA
 
 

25 ppm [12.5 ppm Action Level]

 REL-TWA TLV-TWA
 
 

50 ppm [1997]

 PEL-TWA
 
 

25 ppm (87 mg/m³)
PEL-STEL
 
 

125 ppm

 REL-STEL TLV-STEL PEL-STEL
 
 

125 ppm (435 mg/m³)
PEL-C REL-C TLV-C PEL-C
Skin notation
 
 

Y

 Skin notation
 
 

Y

 Skin notation
 
 

N

 Skin notation
 
 

N
Notes:
 
 

See 29 CFR 1910.1052

 Notes:
 
 

CARCINOGEN (Ca): REDUCE EXPOSURE TO LOWEST FEASIBLE CONCENTRATION. See Appendix A, NIOSH Potential Occupational Carcinogens.

 Notes:
 
 

BEI®

 Notes:
 
 

See also Section 5202.
Health factors:  See NIH-NLM PubChem. IDLH
 
 

2300 ppm
Carcinogenic classifications: IARC-2B, NIOSH-Ca, EPA-B2, NTP-R, OSHA-Ca, TLV-A3 Notes:
 
 

Ca
AIHA emergency response planning guidelines - ERPG-1/ERPG-2/ERPG-3:
 
 

300 ppm/750 ppm/4000 ppm

Additional Resources and Literature References

Last Updated Date : 01/06/2024